Coring tool



May 4 1926. F. E. SHRIVER CORING TOOL Filed Sept. 15, 1924 WITNESSES Patented May 4, 1926.

FRANK ELMER SHRIVER, OF BADARPUR GHAT, INDIA.-

OORING TOOL.

Application filed September 15, 1924. Serial No. 737,873.

To aZZ whom it may concern:

Be it known that I, FRANK ELMER Srrnrvini, a citizen of the United States, and a resident of Badarpur Ghat, Assam, India, have invented certain new and useful Improvements in Goring Fools, of which the following is a specification.

This invention relates to a coring tool for use in obtaining samples of formations and is'especially designed for use in connection with the rotary method of drilling.

The object of theinvention is to provide a coring tool of this character which collects a core or sample of the formation and insures the retention of this core while the tool is being withdrawn.

A further object 'is to provide a coring tool having these capacities and advantages and which is entirely practical in its construction, reliable in operation and easy and comparatively inexpensive to manufacture.

A still further object is to provide a coring tool of this character and wherein provision is made for the circulation of the mud or fluid used in the rotary drilling operation. 7

Other objects and advantages of the invention reside in certain novel features of the construction, combination and arrangement of parts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming part of this specification, and in which:

Figure 1 is a view in vertical section through a coring tool embodying the present invention a Figure 2 is a view taken in horizontal section, on line 22 of Figure 1; and

Figure 3 is a bottom plan view.

Referring to the drawings, wherein for the sake of illustration is shown one embodiment of the invention, then'umeral 5 designates generally an outer barrel or hollow body portion. This barrel 5 comprises a section of standard drill pipe, designated generally at 6 and having a sub or.connec tion 7 coupled to its upper end by means of a coupling sleeve 8. A hollow cutting head 9 is connected to the lower end of the section 6 by means of a coupling or sub 10.

The connection 7 carries a plug 11 by means of spider arms 12 and between the spider arms 12 spaces or passages 13 are formed. An inner barrel 14iis connected to the plug 11 by means of a coupling sleeve 15 whereby the plug 11 closes the upper end of the barrel 1% and assists in the support of the same. The lower end of the barrel 1 1 tits in an annular flange 16 integrally formed with the sub 10, and the lower edge of this barrel 14; rests on an annular shoulfreely.

Inorder to insure. the retention of the core in the core collecting means, the coupling or sub 10 is recessed, as at 21, and in these recesses slips 22 are slidably fitted. The bottom walls of the recesses are inclined, and the rear faces of the slips are correspondingly inclined so that as the slips move downwardly their serrated faces 23 are projected into the bore or opening of the coupling 10 to engage the core. When the slips 22 are moved upwardly they move back into the recesses 21 and for this reason they do not interfere with the buildin up of the core. The teeth or serrations of the slips are upwardly directed, as shown in the drawing. Of course the recesses 21 have a greater vertical extent than the slips to permit the slips to move as described.

Automatic means is provided for main tainin the slips in retracted position in the recesses 21 and comprises operating pins 25 having heads 26 engageable with the lower ends of the slips 22. The rods 25 and their heads 26 are slidably fitted in openings provided therefor in the cutting head 9, and the lower ends of the rod project beyond the lower end of the cutting head so that as the cutting head is being advanced, these pins or rods 25 are pushed upwardly to displace the slips 22 up into the recesses 21. On the other hand. when the tool is being withdrawn, the weight of the slips 22 and rods or pins 25 together with the weight of the core causes the slips 23 to move downwardly and consequently into binding engagement with the core. I

From the space between the barrel 14; and the section 6 passages 30lead down through the coupling 10 and cutting head 9 so that the mud or fluid fed down through the subs 7 will pass through the passages 13 and through the space between the barrel 14 and the section 6 into the passages" from whence itis discharged below the cutting head. In this manner the cuttings are carried away and the tool is kept cool so as to prevent burning of the core.

I claim:

1. A coring tool for use in obtaining san' ples of torn'iations and comprising an outer barrel consisting of a section of pipe a sub coupled to the upper end of the section oi pipe and having a plug supported therein in spaced relatioi'rto the inner wall thereof, an inner barrel arranged within the outer barrel in concentric spaced relation with respect thereto and having its upper end connected to and closed by said plug. a couplin; connected to the lower end of the section of. pipe and having means for supporting the lower end of the inner barrel, a cutting; head carried by tl e lower end of said coupling, the cutting head and the coupling having openings alined with each other and with the opening of the inner barrel to define a core collecting chamber, said coupling and said cutting head having passages extending therethrough and comnumicating with the space between the inner and outer barrels to provide for the circulation of fluid, slips carried by the coupling for retaining the core in the core collecting chamber, and pins slidably mounted on the cutting head and engaged with theslips, the forward ends oi the pins projecting' beyond the cutter head to automatically retract the slips during the cutting operation. 7

2. A coring tool for use in obtaining samples of formations and comprising an outer barrel, cutting means carried by the outer barrel core collecting means carried by the outer barrel slips for retaining the core in the tool, and automatic means for holding: the slips retracted while the core is being collected while permitting the slips to engage and hold the core when the tool is being withdrawn, and comprising pins slidably mounted on the tool and engageable with the slips, the forward ends of the pins projecting' beyond the forward end of the tool.

FRANK ELMER SHRIVER. 

